Cabin Air Filter Access - GMC Terrain Forum
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post #1 of 3 (permalink) Old 05-30-2019, 06:06 PM Thread Starter
Join Date: Apr 2018
Posts: 1
Question Cabin Air Filter Access

I have a 2018 Terrain and want to replace the cabin air filter. There are two hex-head nuts that have to be removed from the access door behind the glove box. What is the size of nut driver or socket that is needed for those nuts? The owner's manual does not recognize that those nuts are there but describes pushing in on releases on either side of the access door. Oh, well!
dcoonrod is offline  
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post #2 of 3 (permalink) Old 05-31-2019, 07:19 AM
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Join Date: May 2017
Posts: 172
Most vehicles just use those two plastic releases as mentioned. you push out on each to move them from their seated positions. Then the glove box will swing down completely exposing the cabin filter and it's housing unit. There not just clips holding the door closed now I need to look again...Unless our 2017 is completely different ? You move the single plastic clip in the middle a little to release the already opened glove box and the door swings down further. The filter access door only has two black plastic clips that are moved, bent up a little bit each and the filter door opens., friction fit only no hex head nuts. The clips are on the bottom of the access door; just above the white bar code label, the two hexhead nuts I see have nothing to do with opening the cabin filter compartment access door. They look like they secure the secure housing unit itself in place maybe ?
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post #3 of 3 (permalink) Old 06-04-2019, 04:57 PM
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Join Date: Feb 2018
Location: Southwestern Ontario, CA
Posts: 63
5.5mm, I just changed my cabin filter a couple weeks ago. Pretty easy to do. Hardest part was removing the damper from the side of the glove box. I will say the replacement filter I got from Advance auto is sturdier than the OEM one but does not have the same number of pleats.

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